header.navbar.bavbar-expand.navbar-dark.flex-column.flex-md-row 
    a.navbar-brand.mr-0.mr-md-2(href='/') 豆瓣预告片
    .navbar-nav-scroll  
        ul.navbar-nav.bd-navbar-nav.flex-row
            li.nav-item
                a.nav-link.active(href='/docs/4.0') 快捷链接